What is a kilowatt hour, or kWh?
A kWh is the common unit for measuring electricity, similar to the way that a gallon is a unit of measurement for liquids like milk and a pound is a unit for measuring weight. When you use 1000 watts of electricity for one hour it is 1 kWh. 1kWh is the equivalent to using a hair dryer 4 times for 15 minutes or running a small refrigerator for 24 hours.